﻿using System;
using System.Web.Mail;

namespace MLib.Networking.Gmail
{
    /// <summary>
    /// Provides a message object that sends the email through gmail. 
    /// GmailMessage is inherited from <c>System.Web.Mail.MailMessage</c>, so all the mail message features are available.
    /// </summary>
    public class GmailMessage : System.Web.Mail.MailMessage
    {

        #region CDO Configuration Constants

        private const string SMTP_SERVER = "http://schemas.microsoft.com/cdo/configuration/smtpserver";
        private const string SMTP_SERVER_PORT = "http://schemas.microsoft.com/cdo/configuration/smtpserverport";
        private const string SEND_USING = "http://schemas.microsoft.com/cdo/configuration/sendusing";
        private const string SMTP_USE_SSL = "http://schemas.microsoft.com/cdo/configuration/smtpusessl";
        private const string SMTP_AUTHENTICATE = "http://schemas.microsoft.com/cdo/configuration/smtpauthenticate";
        private const string SEND_USERNAME = "http://schemas.microsoft.com/cdo/configuration/sendusername";
        private const string SEND_PASSWORD = "http://schemas.microsoft.com/cdo/configuration/sendpassword";

        #endregion

        #region Private Variables

        private static string _gmailServer = "smtp.gmail.com";
        private static long _gmailPort = 465;
        private string _gmailUserName = string.Empty;
        private string _gmailPassword = string.Empty;

        #endregion

        #region Public Members

        /// <summary>
        /// Constructor, creates the GmailMessage object
        /// </summary>
        /// <param name="gmailUserName">The username of the gmail account that the message will be sent through</param>
        /// <param name="gmailPassword">The password of the gmail account that the message will be sent through</param>
        public GmailMessage(string gmailUserName, string gmailPassword)
        {
            this.Fields[SMTP_SERVER] = GmailMessage.GmailServer;
            this.Fields[SMTP_SERVER_PORT] = GmailMessage.GmailServerPort;
            this.Fields[SEND_USING] = 2;
            this.Fields[SMTP_USE_SSL] = true;
            this.Fields[SMTP_AUTHENTICATE] = 1;
            this.Fields[SEND_USERNAME] = gmailUserName;
            this.Fields[SEND_PASSWORD] = gmailPassword;

            _gmailUserName = gmailUserName;
            _gmailPassword = gmailPassword;
        }

        /// <summary>
        /// Sends the message. If no from address is given the message will be from <c>GmailUserName</c>@Gmail.com
        /// </summary>
        public void Send()
        {
            try
            {
                if (this.From == string.Empty)
                {
                    this.From = GmailUserName;
                    if (GmailUserName.IndexOf('@') == -1) this.From += "@Gmail.com";
                }

                System.Web.Mail.SmtpMail.Send(this);
            }
            catch (Exception ex)
            {
                //TODO: Add error handling
                throw ex;
            }
        }

        /// <summary>
        /// The username of the gmail account that the message will be sent through
        /// </summary>
        public string GmailUserName
        {
            get { return _gmailUserName; }
            set { _gmailUserName = value; }
        }

        /// <summary>
        /// The password of the gmail account that the message will be sent through
        /// </summary>
        public string GmailPassword
        {
            get { return _gmailPassword; }
            set { _gmailPassword = value; }
        }

        #endregion

        #region Static Members

        /// <summary>
        /// Send a <c>System.Web.Mail.MailMessage</c> through the specified gmail account
        /// </summary>
        /// <param name="gmailUserName">The username of the gmail account that the message will be sent through</param>
        /// <param name="gmailPassword">The password of the gmail account that the message will be sent through</param>
        /// <param name="message"><c>System.Web.Mail.MailMessage</c> object to send</param>
        public static void SendMailMessageFromGmail(string gmailUserName, string gmailPassword, MailMessage message)
        {
            try
            {
                message.Fields[SMTP_SERVER] = GmailMessage.GmailServer;
                message.Fields[SMTP_SERVER_PORT] = GmailMessage.GmailServerPort;
                message.Fields[SEND_USING] = 2;
                message.Fields[SMTP_USE_SSL] = true;
                message.Fields[SMTP_AUTHENTICATE] = 1;
                message.Fields[SEND_USERNAME] = gmailUserName;
                message.Fields[SEND_PASSWORD] = gmailPassword;

                System.Web.Mail.SmtpMail.Send(message);
            }
            catch (Exception ex)
            {
                //TODO: Add error handling
                throw ex;
            }
        }

        /// <summary>
        /// Sends an email through the specified gmail account
        /// </summary>
        /// <param name="gmailUserName">The username of the gmail account that the message will be sent through</param>
        /// <param name="gmailPassword">The password of the gmail account that the message will be sent through</param>
        /// <param name="toAddress">Recipients email address</param>
        /// <param name="subject">Message subject</param>
        /// <param name="messageBody">Message body</param>
        public static void SendFromGmail(string gmailUserName, string gmailPassword, string toAddress, string subject, string messageBody)
        {
            try
            {
                GmailMessage gMessage = new GmailMessage(gmailUserName, gmailPassword);

                gMessage.To = toAddress;
                gMessage.Subject = subject;
                gMessage.Body = messageBody;
                gMessage.From = gmailUserName;
                if (gmailUserName.IndexOf('@') == -1) gMessage.From += "@Gmail.com";

                System.Web.Mail.SmtpMail.Send(gMessage);
            }
            catch (Exception ex)
            {
                //TODO: Add error handling
                throw ex;
            }
        }

        /// <summary>
        /// The name of the gmail server, the default is "smtp.gmail.com"
        /// </summary>
        public static string GmailServer
        {
            get { return _gmailServer; }
            set { _gmailServer = value; }
        }

        /// <summary>
        /// The port to use when sending the email, the default is 465
        /// </summary>
        public static long GmailServerPort
        {
            get { return _gmailPort; }
            set { _gmailPort = value; }
        }

        #endregion

    }

}
